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In the C++ standard library, the `` header file contains some useful utility classes and functions, which are very useful when writing efficient and readable code. The core value of the `utility` library lies in: * Provides basic data structures and utility functions * Simplifies implementation of common programming tasks * Provides foundational support for other standard library components Although the `utility` header file is small, the tools it provides are very useful: | Component/Function | Purpose | Use Case | | --- | --- | --- | | `std::pair` | Stores two related values | Function returning multiple values, map elements | | `std::make_pair` | Conveniently create pair | Template type deduction, code simplification | | `std::swap` | Swap two values | Algorithm implementation, sorting operations | | `std::move` | Enable move semantics | Resource management, performance optimization | | `std::forward` | Perfect forwarding | Universal references, template programming | * * * ## Core Components Explained ### std::pair: Key-Value Container `std::pair` is the most commonly used component in the `utility` library, used to combine two values into a single object. #### Basic Syntax #include // Basic way to create pair objects std::pair variableName(value1, value2); ## Example #include #include #include int main(){ // Method 1: Direct initialization std::pair student1(101, "Alice"); // Method 2: Using make_pair function (recommended) auto student2 = std::make_pair(102, "Bob"); // Method 3: Deduction guides supported since C++17 std::pair student3(103, "Charlie"); // Access pair members std::cout<<"Student ID: "<< student1.first<<", Name: "<< student1.second<< std::endl; return 0; } #### Common Operations on pair ## Example #include #include void pairOperations(){ // Create pairs std::pair